Improvement in dust-protectors for watches



P. M. STAITZEVLL.

improvement in Dust-Protectors for Watches.

N0. 2@,908, Patented May 27,1872.

C it E q H 4 J UNITED STATES PATENT OFFICE.

PETER M. STATZELL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO STATZELL,ENGLEHART & ENGLEHART, OF SAME PLACE.

IMPROVEMENT IN DUST-PROTECTORS FOR WATCHES.

Specification forming part of Letters Patent No. 126,908, dated May 21,1872.

To all whom it may concern:

Be it known that I, PETER M. STATZELL, of city and county ofPhiladelphiaand State of Pennsylvania, have invented new and usefulImprovements in Dust-Protectors; and I do hereby declare the followingto be a clear and exact description of the nature thereof, sufficient toenable others skilled in the art to which my invention appertains tofully understand and use the same, reference being had to theaccompanying drawing making part of this specification, in which Figurel is an inside view of a watch having my invention applied thereto. Fig.2 is an enlarged view thereof, a portion being removed. Fig. 3 is an endview thereof. 4

My invention relates to dust-protectors of watches, and consists inmechanism for preventing the passage of dust, &c., through the openingfor the post of the balance-wheel. It also consists in a plate or piecefor preventing the passage of dust, 820., to the barrel.

Referring to the drawing, A represents the plate of a watch of theportion occupied by the balance-wheel. B represents the balance wheel;(J, its post or axis; 1), the cock; E, the bridge; and F, the openinginthe platethrough which passes the post or axis 0, all of which may be ofusual form and construction. To the plate A, near the opening F, thereis an ranged the protector G, which consists of two jaws, H H, which inthe present case have a common axis, a, and the eyes a of the joint moveon each other. These jaws are formed of the parts J J and K K. The partsJ occupy spaces surrounding the axis (J, and have semicircular openingsI) b at opposite points, so that when the jaws are brought together thefaces 0 0 will come in contact and the openin gs b b form a circularopening encircling the axis 0, thus completely covering the opening F,yet in no wise interfering with the free movement of the axis. Toprevent the parts from grasping or binding the said axis, a small pin orstop may be arranged to limit the closing movements of the parts. Theparts K consist of extensions of the parts J beyond the axis a, andconstitute stops to limit the outward movements of the parts J andhandles, or means for conveniently operating the aws.

l/Vhen the protector is applied, the parts J are brought together so asto close the opening F, as described, whereby dust, 850., is preventedfrom entering the said opening and the watch is accordingly protected.When it is desired to open the protector the parts K are pressed againstor toward each other so that the parts J are caused to recede from eachother, and the parts K come to astop with each other, thus limiting andstopping the out-- ward movements of the parts J, whereby other portionsof the watch will not be disturbed or injured.

The barrel L of the watch is covered in part by the cock D and bridge E;but this leaves an uncovered spot at the part over which sweeps aportion of the periphery of the balance-wheel, and beneath a portion ofthe cock. This spot will be covered by a protector, M, which consists ofa piece of elliptic form, extending from the inner end cl of the bridgeE, or made separately'thereirom, and secured to the plate A. In eithercase this protector M lies over part of the barrel, beneath portions ofthe balance-wheel and cock, as at e f, and close to the portion (Z orthe bridge, so that the barrel will be completely covered at top, and,by means of the other portions of the watch, ineased and protectedagainst dust, etc.

The edge 9 of the protector M, which faces the axis of thebalance-wheel, will be beveled or sloped to prevent contact with thehairspring, and the consequent interference with its free motions.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The protector G, constructed and applied, substantially as described.

2. The protector M, constructed and applied, substantially as described.

The above signed by me this 11th March, 1872.

day of P. M. STATZELL. Witnesses:

JOHN A. WEIDERSHEIM, ALFRED O. SAvIonE.

